Improvement in saw-gauges



WILLIAM oLnMsoN, or MIDDLE'roWN, NEW voeu.`

Letters Patent No. 101,229, dated March 29, 1870.

IMPROVEMNT IN SAW-GAUGES.

The Schedule referred to in these Letters Patent and making part cf the same.

To whom fit may concern.-

Beit known that I, WILLIAM GLEMsoN, of Middletown, in the county of Orange and State of New York, have invented certain'useful Improvements in Gauges for Filing the Teeth of Cross-cnt Saws, of which the following is a specification.

In the drawings-v Figure l is a sectional side view of a saw and the gauge in position, and

` Figure 2 is a perspective view ot' the gauge.

A represents the gauge;

B, a section of a cross-cut saw;

O G C C, the usual scoring or cutting-oh" teeth of .a cross-cut saw;

D is a double-clearer tooth, having the two sharp a is a slot or mortise through the center of gange- A; and

a a are longitudinal grooves in the ends of the gauge.

In cross-cut saws as now generally used, having scoring-teeth that are alternately set in opposite directions, and filed sharp, so as to successfully out ot the fiber of' the wood at each side of hert', which is just wide enough to clear the saw from pinching in the kerf, and having clearing-teeth, which are led to be shorter, or in other words,do` not project so far from the saw-plate as the scoring-teeth by the depth of the cut of the scoring-teeth, there is a dificulty in ling oi' the points of the clearing-teeth so that all the clearing-teeth shall have the same length of projecton, or that the points of all the clearing-teeth shall have the same projection with relation to the extreme points of the scoring-teeth, as, without such accuracy of relation of theprojection of the scoringteeth with the lclearing-teeth, the saw will not cut evenly its whole length, will not run steadily, nor out at all parts of its length the same; and in 'order to furnish a ready and easy means of overcoming this difficulty this invention isnow sought ont and made practical; and

The invention consists in the special construction of the gauge, adapted to be used upon a saw, whereby the clearing-teeth maybe reduced to their proper length.

The gauge A is made from a bar of steel, in the form seen in iig. 2, the middle portion being depressed at e e below thetop of the bar at its ends at d d, and s'o as to have the shape as seen in working position in fig l tudinal grooves, made centrally in the width of' the gauge.

These grooves restupon the tops of the scoringteeth, while thedouble-pointed clearing-tooth D passes n the underside of the two ends d cl are longi-` through the mortise a in the center of the depressed part of the gauge, the top of which, when the gauge is in position, is just as much below theliue 0 o, which line represents the top of the points of' the scoringteeth and the bottom of the grooves in the ends d d of the gauge A which rest upon the points of the scoring-teeth, as the clearing-teeth should be shorter than the said scoring-teeth, as seen in fig. 1.

It" the points b b of the clearing-teeth project above the top oi' the gauge when placed as above described, andas seen in tig. 1, they will be led oit' by drawing the le upon them until they are reduced to be even with the top of the middle part of the gauge, when the proper shape may be given to the two points d d by tiling, or otherwise dressing them to their proper-- shape, as seen in dotted lines in fig. 1, which will give j `the right project-ion to all the clearing-teeth, and so as that t-he saw will work evenly and truly, as well as to cut and clear freely and without chattering or clogging,

The gauge may be constructed without the groove c' a', but for those who are not experienced in its use, the grooves form the means of holding the gauge better upon the teeth of the saw.

The inortise or slot a should he large, so as to fit loosely ou the clearing-tooth D, andbe free to adj ust itself to the teeth and the direction that the file may give it, as persons not in the habit of using a iile do' not always reciprocate it at right angles with the side of the saw-plate, nor are the reci'procationseof the le in inexperienced hands always parallel; but generally such persons give the tile such a motion as 'to file the top of the points a little convex, and, by giving a loose lit to the gauge upon the tooth D, the gauge will roll alittle and prevent the file from giving a convex or inclined finish on the tops of the clearing-teeth, as they should be perfectly at right angles with the sides of thc saw-plate.

The face or upper side of the-depressed part of the gauge will be hardened, which will prevent its being ent away by contact with the le, as the file mustV in every instance dress the clearing-points off even with the top of the gauge.

By the use of this gauge, as shown and herein described, the points of the scoring-teeth are protected from being damaged by .the le while reducing the clearing-teeth to their proper length.

The gauge is simple in construction and in its use, easily nmlerstoodand applied to use, and costs but little.

1 am aware that gauges for ling the clearingteeth of cross-cut saws to the proper length have been in use, and such gauge is described in a patent granted to A. E. Hoffman, Febrnaryf), 1869; but while said gauge described in that patent will do what mine is roms intended to do, yet mine is cheaper in its construe- What I claim, and desire to secure by Letters Pat tion, requiring less metal, is less cumbersome.- has :t ent, isbroader surface by which to gauge the length of the As a new article of manufacture, the saw-gauge A, toot-h, which prevents the tile from cutting away Vthe constructed in the manner above described. gauge itself, and tends to guide the file to cut the WILLIAM CLEMSON. point of Vthe tooth zit right angles to the side of the saw-blade.

Having thus fully described my invention,

Witnesses ELISHA- P. WHEELER, EDWARD M. MADDEN. 

